Ignition apparatus



Aug. 23, 1932. J, L ARTHUR 1,873,174

IGNITION AFPARATUS 'Filed DEO. 1:1. 1931 r.Patented Aug. 23, 1932 UNITED ,STATES- PATENT fori-ICE ,JAMES L. ARTHUR, OF ANDERSON, INDIANA, ASSIGNOR TO DELCO-BEMY CORPORA- TION, F ANDERSON, INDIANA, A CORPORATION 0F DELAWARE ksuction in the fuel intake passage of the en- IeNIrIoN ArrAnA'rUs application mea December 11, 1931. serial no. 580,279.

This invention relates to ignition apparatus for internal combustion -engines and more particularly to the control ofthe timing of the ignition in response to engine operating conditions andk particularly in response to 'timer control which will advance the spark during engine operatingv conditions but which will not advance the spark while cranking the engine.

Further objects and advantages of the presentl invention will be vapparent from the following description, reference being had to the accompanying drawing wherein a preferred embodiment of one form of the present invention is.clear1y shown.

In the drawing: The figure of the lustrating the present invention.

Referrin to the'drawing, the ignition .cir-l cuit comprises a coil 20 having a primary 21 and a secondary 22, the primary being connected with a battery 23 a circuit breaker lever 29 rough a switch 24. The battery is grounded at 25. The primary 21 is connected by wire 26 with a terminal V27 connected by a leaf spring conductor 28 with ivoted on a post 30 carried by a circuit brea er lever plate 31 rotatable about the axis of the shaft 32 which drives a cam 33. The cam V33 cooperates with a rubbing block 34 which is connected with -the spring 28, attached to the lever- 29. The

lever 29 carries a contact 35 which cooperates with a` grounded contact 36. The plate .31

has an arm 40 connected by a` pin-41 with a rod 42-whichr is providedwith an extension '43 of reduced diameter which'provides a riv-f et to which are attached tothe rod 43 two op positcly arranged cup-shaped washers 45 and drawing is ay diagram il-I '44 and a iexible7 diaphragm 46 located between them. The circular'edge of the diaphragm 46fis pinched between anges 47 and 48 of suction chamber housing members 49 and 50 respectively. The flange 48 is bent over at 51 to engage the flange 47 The member y 49 provides a sleeve 52 serving as a guide for the rod 42 and has a vent hole 49a. Themember 50 carries a tubular bushing 53 which lo- Cates one end of the'spring 54, the other end being located by the washer 45. The spring 54 tends Vto keep the diaphragm 46 in a posiltion for retarding the spark, the 'direction of retarding movement of the arm 40 being indicated by the arrow 55. The cam 33 rotates counterclockwise as indicated by arrow 56.

The tubular bushing 53 is connected by pipe 60 with a valve body 61 which provides a central vertical passage 62 and side pas'- sages 63, 64 and 65, the passage l63 continuing from the pipe 60.4 The passage 64 is connected by passage 66 with the passage 67 in a carburetor passage 68 and located just-below the throttle valve 69 whenA in engine idling position as shown in the drawin The carburetor passage 68- is rovide with a venturi 70 surroundlng a el nozzle -71 connected with a fuel bowl 72. :The passage 65 is connected by a pipe 73 with a passage 74 inthe carburetor passage 68, the passage 74 being located inside the carburetor choke valve 75. The communication between the passages 63 and 64 in the valve body 71 is controlled by a vertical slidable valve having a circumferential groove 81 locatedibetween flanges 82 and 83 which provide bearings for the valve`80. The valve 80 is urged upwardly against the cross pin 84 by asprlng 85 held in'position by a screwr block 86.

When it isdesired to accelerate the engine from idling the valve`69 is opened to a posi- .tion such as 69a thereby increasing the `suc'- tion at the pipe 67 and thereby decreasing the pressure .below the diaphragm 46 whereby the ddiaphragm will move into the dotand-dash line position 46a to advance the spark to a greater extent than might be possible with a known form of speed responsivel advance mechanism, (not shown) with which ignition timers are now usually provided. 1

the throttle tion although the throttle valve .while cranking.

When cranking the engine however with partly opened as indicated by the position 69a ofthe throttle 69, it may not be desirable to advance the ignition to greater than the extent provided by the centrifugal advance mechanism. Since it is the usual ractice to choke the carburetor when cranking the engine, advantage-is taken of the fact that durmg. cranking with the choke closed, there is a substantial suction in the car-` buretor pipe 68 inside of the choke valve 75. When the valve 75 is closed as shown in the diagram, there will be a substantial reduction in pressure inthe pipe 73, and this osubatmosphelfic pressure is-communicated to that part of the passage 62 of valve body 61 below the valve 80. Consequently the valve 80 4moves downwardly against the resistance of the spring to close off communication between the passages-64 and 63. lI-Ience, during the cranking of the engine with the carburetor choke valve 7 5 closed, the suction device will not operate tovadvance the igni- 69 may be inl a 'partly open position l When the choke isclosed, part 63 is immediately vented to relieve any vacuum below" diaphragm and the spark will beimmediately retarded.

As soon as the engine fires, the operator`- will generally release the choke control knob to permit the choke valve to move by a spring (not shown) to the normal open position 7 5a.`

Immediately the suction at opening 75^Will .decreaseand the spring 85 will return the vvalve 80 to the position shown, whereupon fuel throttle valve,4 a circuit interrupter, an

yengine driven'- cam for operating rupter, a device having communlcation with4 engine driven cam tion for controlling the angular relation between the interrupter and cam in order to tion for controlling the angular relation between the interrupter and cam inv order to advance the ignition timing as the throttle valve is opened, and a suction operated valve responsive to the closing of the choke valve and operated by suction in the carburetor between its said valves for closing off communication between the suction operated controlling device and the carburetor.

In testimony whereofI hereto ax my sig` nature.

J L. ARTHUR.

for operating the interrupter, a device responsive to engine suc- 1 control the timing of the ignition, and means responsive to closing the choke valve of the carburetor and operated by suction in the carburetor between said valves for preventlng the operation of the suction ldevice to control the ignition timing.

2. Ignition apparatusfor internal combustion engmes comprlsingfin combination, a

carburetor having an air choke valve and-a fliel throttle, valve, a circuit interrupter, an

the interthe carburetor and responsive to engine suc- 

